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REX E LOESBY PE <br />3037719632 <br />• • <br />consistent with the existing natural topography and will blend well in the mountain tenein. The <br />photo at right, taken in 1988, shows the upper waste pile le@ from pre-1941 operations. Sierra <br />will continually monitor existing and new waste pile scopes. If significant unstable conditions <br />develop, corrective stabilization actions will be taken, either by reducing the slopes or through <br />-r`~_~ <br />North <br />Scale: t in. ~ 200 fL <br />20 Foot Coatoun <br />Rez !c Loesby <br />ColornUo PE No. 20338 <br />5edimeet <br />Control <br />Structure <br />'~ AveraBeSlopc:2:1 <br />Yule Quarry Post Reclamation Contours <br />P. B8 <br />mechanical stabilization methods. As outlined in the Mining Plan section above, Sierra plans to <br />deposit new waste to the piles so the 5rta1 slope in these new areas does not exceed 2:1. The <br />contour maps on the following page show the current contours of the waste pile areas and an <br />estimate for the maximtun extent ofthe waste piles post reclamation. The final contouus were <br />estimated based on a maximum 2:1 final slope. The volume created by the maximum extent of <br />the waste piles is estimated at 159,000 cubic yards. Asstuning a density of 1.5 tons per cubic <br />yazd results in a waste pile capacity of 240,000 short tons, well in excess of the total amount of <br />waste to be generated over the life of planned operation. Initially, waste blocks witl be placed to <br />the east and south of the existing waste piles, being careful to not impact any area where CYMC <br />may have caused a violation of its permit. Also, no fates will be placed on the waste piles until <br />an effective sediment control structure is established. Once a suitable sediment control structure <br />is established, Sierra will begin to deposit waste near the north end of the waste pile area just <br />above the sediment control structtuc. Access to this area will be off the south end of the existing <br />easterly waste pile road, then down the existing jeep trail. The waste pile will be built up from <br />this azea, according to the contours shown on Post Reclamation Contours map above. The <br />average final slope will be no greater than 2:1. <br />